Damn. There goes one pet theory I had. I remember a few years ago, when Rickson came to Japan to wrestle Nobuhiko Takada, seeing a TV special that showed clips of Rickson working out. He was shown doing some very odd-looking body movements and breath exercises, and lately I've been pondering the possibility that he got some internal training from somewhere and used it to supplement his GJJ, and that was why he was so unbeatable. Some of the statements made by Japanese guys who'd competed against him also seemed to lead in this direction. I can't recall anything specific, but stuff to the effect that he was simply unmovable when he got the mount, and that he felt different from other guys. But if you've felt him and say he didn't have it, well...crap.

Heh, you don't need to have all the skills that've been talked about on this forum to be able to be "unmovable" from the mount. So it wouldn't surprise me if Rickson had some different components tied up nicely in his own way.
There is a HUGE disparity in BJJ guys though. Guys that get tech oriented, and ones that rely more on their structure/postural balance to do simple techs. The manipulation of their internal skills is pretty limited to keeping balance..then again most of the time, what more do you need within that ruleset? (Create space, get position, have base, crank it the #$"k on )